package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和对应的口味
     *
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        //        向菜品表插入一条数据

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        //        向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }


    /**
     * 菜品的批量删除
     *
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
//        判断当前菜品是否能够删除
//        1、起售中的菜品不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                //当前菜品起售中，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //        2、当前菜品是否被套餐关联，
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 当前菜品被套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //        3、删除菜品表中的菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//
//            //  删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

        //        3、删除菜品表中的菜品数据
        dishMapper.deleteByIds(ids);

        //  删除菜品关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }


    /**
     * 根据菜品查询菜品和口味数据
     *
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {

        //        根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //        根据id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //        将查询到的数据封装成vo数据

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        BeanUtils.copyProperties(dishFlavors, dishVO);

        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();

        BeanUtils.copyProperties(dishDTO, dish);
        //        修改菜品表基本信息
        dishMapper.update(dish);
        //        删除口味表原有的口味数据
        dishFlavorMapper.deleteByDishId(dish.getId());
        //        重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }
}
